1 Temperature Distribution in Temperature Distribution in Intumescent Intumescent Coating Protected Coating Protected Steel Connections in Fire Steel Connections in Fire By : X H Dai, Y C Wang, C G Bailey By : X H Dai, Y C Wang, C G Bailey By : X H Dai, Y C Wang, C G Bailey By : X H Dai, Y C Wang, C G Bailey School of Mechanical, Aerospace and Civil Engineering School of Mechanical, Aerospace and Civil Engineering School of Mechanical, Aerospace and Civil Engineering School of Mechanical, Aerospace and Civil Engineering The University of Manchester, UK The University of Manchester, UK The University of Manchester, UK The University of Manchester, UK
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1
Temperature Distribution in Temperature Distribution in IntumescentIntumescent Coating Protected Coating Protected
Steel Connections in FireSteel Connections in Fire
By : X H Dai, Y C Wang, C G BaileyBy : X H Dai, Y C Wang, C G BaileyBy : X H Dai, Y C Wang, C G BaileyBy : X H Dai, Y C Wang, C G Bailey
School of Mechanical, Aerospace and Civil EngineeringSchool of Mechanical, Aerospace and Civil EngineeringSchool of Mechanical, Aerospace and Civil EngineeringSchool of Mechanical, Aerospace and Civil Engineering
The University of Manchester, UK The University of Manchester, UK The University of Manchester, UK The University of Manchester, UK
Outline of fire protection optionsOutline of fire protection optionsOutline of fire protection optionsOutline of fire protection optionsOutline of fire protection optionsOutline of fire protection optionsOutline of fire protection optionsOutline of fire protection options
��Protecting a segment of beam of 300mm or Protecting a segment of beam of 300mm or
400mm from the connected end.400mm from the connected end.
��Leaving the bolts unprotected in a protected Leaving the bolts unprotected in a protected
joint assembly.joint assembly.
��Protecting column only.Protecting column only.
5
Typical fire protections appliedTypical fire protections appliedTypical fire protections appliedTypical fire protections appliedTypical fire protections appliedTypical fire protections appliedTypical fire protections appliedTypical fire protections applied
Main research objectivesMain research objectivesMain research objectivesMain research objectivesMain research objectivesMain research objectivesMain research objectivesMain research objectives
��Effect of Effect of protecting a small segmentprotecting a small segment of the beam of the beam near the joint on temperature developments in near the joint on temperature developments in joint componentsjoint components
��Effect of Effect of not protecting boltsnot protecting bolts on temperature on temperature developments in joint componentsdevelopments in joint components
��Effect of Effect of protecting column onlyprotecting column only on temperatures on temperatures in joint components and column itselfin joint components and column itself
��Develop a Develop a simple calculation methodsimple calculation method to predict to predict temperature distribution in connections protected temperature distribution in connections protected using using intumescentintumescent coating coating
8
Effect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on to
as as full beam protection to full beam protection to
connection componentsconnection components
9
Effect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on toEffect of partial beam protection on to
as as full beam protectionfull beam protection to to
bolts.bolts.
10
Effect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on to
connection components in a protected joint (1)connection components in a protected joint (1)connection components in a protected joint (1)connection components in a protected joint (1)connection components in a protected joint (1)connection components in a protected joint (1)connection components in a protected joint (1)connection components in a protected joint (1)
Whether or not protecting the bolts had minor influence on temperature
developments in the protected connection components
11
Effect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on to
connection components in a protected joint (2)connection components in a protected joint (2)connection components in a protected joint (2)connection components in a protected joint (2)connection components in a protected joint (2)connection components in a protected joint (2)connection components in a protected joint (2)connection components in a protected joint (2)
Higher temperatures in unprotected bolts but still much lower than bolt temperature in an unprotected joint
Bolt heads were not covered by char
12
Effect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on toEffect of not protecting bolts on to
connection components in a protected joint (3)connection components in a protected joint (3)connection components in a protected joint (3)connection components in a protected joint (3)connection components in a protected joint (3)connection components in a protected joint (3)connection components in a protected joint (3)connection components in a protected joint (3)
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Te
mp
era
ture
(C
)
No.48 (SP7, FP+B)
No.48 (SP8, FP_B)
No.48 (USP1, UP)
Test USP1, unprotected specimen
Test SP8, protection scheme: FP_B
Test SP7, protection scheme: FP+B
60
70
13
460
10
10605 200
X
50
E-E ViewE
E
UB305X165X40
48
Bolt locations
Temperature in unprotected bolt got closer to protected bolt temperature
Bolt heads were covered by char
13
Effect of protecting column only (1)Effect of protecting column only (1)Effect of protecting column only (1)Effect of protecting column only (1)Effect of protecting column only (1)Effect of protecting column only (1)Effect of protecting column only (1)Effect of protecting column only (1)
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Tem
pera
ture
(C
)
No.58 (SP3, PC)No.60 (SP3, PC)No.58 (SP1, FP+B)
No.60 (SP1, FP+B)No.58 (USP4, UP)No.60 (USP4, UP)
Test USP4, unprotected specimen
Test SP3, protecting column only
Test SP1, total protection
UB305X165X40
40
20
0
150
40
60
60
40
10
50 50 50
UC254X254X89
J
J
X60
W eb cleat
150x90x10mm
X58
605
Protecting column only appeared gave similar temperatures in connection components on beam web side as
unprotected
14
Effect of protecting column only (2)Effect of protecting column only (2)Effect of protecting column only (2)Effect of protecting column only (2)Effect of protecting column only (2)Effect of protecting column only (2)Effect of protecting column only (2)Effect of protecting column only (2)
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Tem
pera
ture
(C
)
No.63 (SP3, PC)No.64 (SP3, PC)
No.63 (SP1, FP+B)No.64 (SP1, FP+B)
No.63 (USP4, UP)No.64 (USP4, UP)
Test SP3, protecting column only
Test USP4, unprotected specimen
Test SP1, total protection
UB305X165X40
J-J View
40
20
0
150
40
60
60
40
10
50 50 50
UC254X254X89
90
50 40
J
J
64
63X
X
Web cleat
150x90x10mm
605
Protecting column only slightly reduced temperatures in connection components connected to column
flange
15
Effect of protecting column only (3)Effect of protecting column only (3)Effect of protecting column only (3)Effect of protecting column only (3)Effect of protecting column only (3)Effect of protecting column only (3)Effect of protecting column only (3)Effect of protecting column only (3)
40
505050
40
60
60
40
10
20
19X
X
UB305X165X40
UC254X254X89
Fin plate
(200x150x10mm)
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Tem
pera
ture
(C
)
No.19 (SP6, PC)
No.20 (SP6, PC)
No.20 (SP4, FP+B)
No.19 (USP3, UP)
No.20 (USP3, UP)
No.14 (SP6, PC)
Weld in Test SP6, protecting column only
Weld in Test USP3, unprotected specimen
Weld in Test SP4, total protection
Column section remote from joint in Test SP6, protecting column only.
Protecting column only substantiallyreduced temperatures in fin plate weld
on column flange
16
Conclusions by fire testsConclusions by fire testsConclusions by fire testsConclusions by fire testsConclusions by fire testsConclusions by fire testsConclusions by fire testsConclusions by fire tests
�� Protecting a segment of the connected beam for about Protecting a segment of the connected beam for about 400mm from the joint appeared to be sufficient to 400mm from the joint appeared to be sufficient to achieve full protection for the joint.achieve full protection for the joint.
�� Whether or not protecting bolts had little influence on Whether or not protecting bolts had little influence on temperatures in other connection components in a temperatures in other connection components in a protected joint. protected joint.
�� In a protected joint with unprotected bolts, the In a protected joint with unprotected bolts, the unprotected bolt temperatures were higher than those unprotected bolt temperatures were higher than those with full bolt protection, but still much lower than bolt with full bolt protection, but still much lower than bolt temperatures in a completely unprotected joint. temperatures in a completely unprotected joint.
�� Protecting the column only in a joint appeared not reduce Protecting the column only in a joint appeared not reduce to the unprotected connection component temperatures, to the unprotected connection component temperatures, however the protection did reduce temperatures in however the protection did reduce temperatures in components immediately contacting column flanges.components immediately contacting column flanges.
17
calculation method provided in EN 1993EN 1993--11--2:20052:2005
in in in in in in in in EN 1993EN 1993EN 1993EN 1993EN 1993EN 1993EN 1993EN 1993--------11111111--------2:2005 2:2005 2:2005 2:2005 2:2005 2:2005 2:2005 2:2005 for steel sectionsfor steel sectionsfor steel sectionsfor steel sectionsfor steel sectionsfor steel sectionsfor steel sectionsfor steel sections
,
/m
a t sh net
a a
A VK h t
Cθ
ρ∆ = ∆&
( ), /10
, ,
/ 1( 1)
1 / 3
p t p p
a t t a t t
a a
d At e
c V
φλ
θ θ θ θρ φ
∆ = × × × − ∆ − − ∆ +
/10
, ,
,
1( ) (1 / 3) ( 1)
( )p t p a a a t t
p t a t
Vt d c e
A t
φλ ρ φ θ θθ θ
= × × × + × × ∆ + − ∆ − ∆
Temperatures in unprotected steel sections
Temperatures in fully protected steel sections using coating
(calculation method provided in ENV13381-4:2002)
VAm /
18
Temperatures in standard steel sectionsTemperatures in standard steel sectionsTemperatures in standard steel sectionsTemperatures in standard steel sectionsTemperatures in standard steel sectionsTemperatures in standard steel sectionsTemperatures in standard steel sectionsTemperatures in standard steel sections
The simple calculation method provided in EN 1993The simple calculation method provided in EN 1993--11--2:20052:2005
may be used to assess temperatures inmay be used to assess temperatures in standard steel sectionsstandard steel sections
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Te
mp
era
ture
(C
)
Beam web, by test
Beam flange, by test)
Beam web, by EC, η=333, h=25, ε=0.5)
Beam flange, by EC, η=205, h=25, ε=0.5)
Fire Curve
Fire
Beam web temperature by test and simple method
Beam flange temperature by test and simple method
(b) Comparison of temperatures in protected steel section
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Te
mp
era
ture
(C
)
Beam flange (SP8)
Column f lange (SP8)
Beam (Simple method, SF=209, DFT=1.140mm)
Column (Simple method, SF=133, DFT=0.837mm)
Fire
FireBeam temperature by test
Beam temperature by simple method
Column temperature by simple method
Column temperature by
test
(a) Comparison of temperatures in unprotected steel section)
19
Approximate 2Approximate 2Approximate 2Approximate 2Approximate 2Approximate 2Approximate 2Approximate 2--------D calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods for
Section factorsSection factorsSection factorsSection factorsSection factorsSection factorsSection factorsSection factors and and and and and and and and exposure factors exposure factors exposure factors exposure factors exposure factors exposure factors exposure factors exposure factors for typical connectionsfor typical connectionsfor typical connectionsfor typical connectionsfor typical connectionsfor typical connectionsfor typical connectionsfor typical connections
4 /(2 2 2 )e b cf cf eF d W t t= × × + × + ×
2 ( )cf cf e
s
cf cf e e
W t tF
W t W t
× + +=
× + ×
4 /(2 2 2 )e b f f w
F d L t t= × × + × + ×
2 ( )
( )
f f w
s
f f w
L t tF
L t t
× + +=
× +
1
1 2
2 ( )
( ) (2 ) 2 )
c cf cf
s
c c c w c c cf cf
L t WF
L t t t L t W t
× + +=
− × × + + × × + ×
1
8 /(2 2 2 )e b c cf cf
F d L t W= × × + × + ×
20
33333333--------D calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods forD calculation methods for
Section factorsSection factorsSection factorsSection factorsSection factorsSection factorsSection factorsSection factors and and and and and and and and exposure factors exposure factors exposure factors exposure factors exposure factors exposure factors exposure factors exposure factors for fin connectionsfor fin connectionsfor fin connectionsfor fin connectionsfor fin connectionsfor fin connectionsfor fin connectionsfor fin connections
(2 )
( )
f f w f bs b
s
f w f f bo b
L t t H A nF
t t L H V n
+ + +=
+ +
/[(2 ) ]e be b f f w f bs bF A n L t t H A n= + + +
bn : Bolt quantity in the analyzed joint.
bsV : Side surface area of a bolt excluding the
part inside the connected members.
2bs b b
V d hπ= ×
boV :Volume of a bolt and nut excluding the
part inside the connected members.
2
2 ( )2
bbo b
dV hπ= ×
beV : Two end surface area of a bolt.
22 ( )2
bbe
dV π= ×
21
Temperatures in fully protected joint componentsTemperatures in fully protected joint componentsTemperatures in fully protected joint componentsTemperatures in fully protected joint componentsTemperatures in fully protected joint componentsTemperatures in fully protected joint componentsTemperatures in fully protected joint componentsTemperatures in fully protected joint components
(b) Temperatures in fin plate (SP4)
0
200
400
600
800
0 10 20 30 40 50 60
Time (minutes)
Te
mp
era
ture
(C
)
No.21 (SP4)
No.22 (SP4)
EC, DFT=1.562mm, SF=141
TC22
Simple method
TC21
(a) Temperatures in web cleat (SP1)
0
200
400
600
800
0 10 20 30 40 50 60
Time (minutes)
Te
mp
era
ture
(C
)
No.46 (SP1)
No.51 (SP1)
EC, DFT=0.685mm, SF=90
TC46
TC51
Simple method
The simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperaturesThe simple calculation method may be used to assess temperatures
Temperatures in partially protected joint componentsTemperatures in partially protected joint componentsTemperatures in partially protected joint componentsTemperatures in partially protected joint componentsTemperatures in partially protected joint componentsTemperatures in partially protected joint componentsTemperatures in partially protected joint componentsTemperatures in partially protected joint components
(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)(leaving bolts not protected in a protected joint)
( )pp fp up fp e
T T T T F= + − ⋅
1.1.1.1.1.1.1.1. Temperatures in protected components may be calculated Temperatures in protected components may be calculated Temperatures in protected components may be calculated Temperatures in protected components may be calculated Temperatures in protected components may be calculated Temperatures in protected components may be calculated Temperatures in protected components may be calculated Temperatures in protected components may be calculated
by assuming the joint is fully protected.by assuming the joint is fully protected.by assuming the joint is fully protected.by assuming the joint is fully protected.by assuming the joint is fully protected.by assuming the joint is fully protected.by assuming the joint is fully protected.by assuming the joint is fully protected.
2.2.2.2.2.2.2.2. Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately Temperatures in unprotected bolts may be approximately
calculated by the following method:calculated by the following method:calculated by the following method:calculated by the following method:calculated by the following method:calculated by the following method:calculated by the following method:calculated by the following method:
andandandandandandandandup
T fpT Calculated using the simple calculation methodCalculated using the simple calculation methodCalculated using the simple calculation methodCalculated using the simple calculation methodCalculated using the simple calculation methodCalculated using the simple calculation methodCalculated using the simple calculation methodCalculated using the simple calculation method
eF Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation Exposure factor calculated using the approximate calculation
method as described previouslymethod as described previouslymethod as described previouslymethod as described previouslymethod as described previouslymethod as described previouslymethod as described previouslymethod as described previously
23
The simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict TemperatureThe simple calculation method may be used to predict Temperatures ins ins ins ins ins ins ins in unprotected bolts unprotected bolts unprotected bolts unprotected bolts unprotected bolts unprotected bolts unprotected bolts unprotected bolts
in a protected jointin a protected jointin a protected jointin a protected jointin a protected jointin a protected jointin a protected jointin a protected joint with appropriate section factors and exposure factorswith appropriate section factors and exposure factorswith appropriate section factors and exposure factorswith appropriate section factors and exposure factorswith appropriate section factors and exposure factorswith appropriate section factors and exposure factorswith appropriate section factors and exposure factorswith appropriate section factors and exposure factors
(a) Temperatures in unprotected bolts in a protected fin plate (SP5)
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Tem
pera
ture
(C
)
No.18 (SP5)
EC(3-D), DFT=1.056mm,
SF=137, EF= 0.111
EC(2-D), DFT=1.056mm,
SF=141, EF=0.386
EC, DFT=1.056mm, SF=141,
EF=0
Simple method, Fe =0.386 (2-D)
Simple method, Fe =0.111 (3-D)
Simple method, Fe =0 (full protection)
TC18
0
200
400
600
800
1000
0 10 20 30 40 50 60
Time (minutes)
Tem
pera
ture
(C
)
EC, DFT=0.842mm,
SF=102, EF=0
EC(-2D), DFT=0.842mm,
SF=102, EF=0.2276
EC(3-D), DFT=0.842mm,
SF=102, EF=0.0704
No.7 (SP10)
TC7Simple method,Fe=0.0704 (3-D)
Simple method,Fe=0.2276 (2-D)
Simple method,Fe=0 (full protection)
(b) Temperatures in unprotected bolts in a protected endplate (SP10)
24
Conclusions by numerical analysesConclusions by numerical analysesConclusions by numerical analysesConclusions by numerical analysesConclusions by numerical analysesConclusions by numerical analysesConclusions by numerical analysesConclusions by numerical analyses
The simple calculation methods provided in EN The simple calculation methods provided in EN
19931993--11--2: 2005(E) can be used to predict 2: 2005(E) can be used to predict
temperature developments in unprotected and temperature developments in unprotected and
appropriate exposure factors should be used in appropriate exposure factors should be used in
prediction of temperatures in unprotected bolts prediction of temperatures in unprotected bolts
in a protected joint. in a protected joint.
25
Comments and further studiesComments and further studiesComments and further studiesComments and further studiesComments and further studiesComments and further studiesComments and further studiesComments and further studies
��Limitation of specimen quantity, joint types and Limitation of specimen quantity, joint types and
joint dimension.joint dimension.
��Will the conclusions and calculation methods hold Will the conclusions and calculation methods hold
for joints with other dimensions and types ? for joints with other dimensions and types ?
Validation and parameter studies are being done Validation and parameter studies are being done
by in the University of Manchester.by in the University of Manchester.
26
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